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linux_dsm_epyc7002/tools/perf
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Wang Nan 03e0a7df3e perf tools: Introduce bpf-output event 
Commit a43eec3042 ("bpf: introduce bpf_perf_event_output() helper")
adds a helper to enable a BPF program to output data to a perf ring
buffer through a new type of perf event, PERF_COUNT_SW_BPF_OUTPUT. This
patch enables perf to create events of that type. Now a perf user can
use the following cmdline to receive output data from BPF programs:

  # perf record -a -e bpf-output/no-inherit,name=evt/ \
                    -e ./test_bpf_output.c/map:channel.event=evt/ ls /
  # perf script
     perf 1560 [004] 347747.086295:  evt: ffffffff811fd201 sys_write ...
     perf 1560 [004] 347747.086300:  evt: ffffffff811fd201 sys_write ...
     perf 1560 [004] 347747.086315:  evt: ffffffff811fd201 sys_write ...
            ...

Test result:

  # cat test_bpf_output.c
  /************************ BEGIN **************************/
  #include <uapi/linux/bpf.h>
  struct bpf_map_def {
 	unsigned int type;
 	unsigned int key_size;
 	unsigned int value_size;
 	unsigned int max_entries;
  };

  #define SEC(NAME) __attribute__((section(NAME), used))
  static u64 (*ktime_get_ns)(void) =
 	(void *)BPF_FUNC_ktime_get_ns;
  static int (*trace_printk)(const char *fmt, int fmt_size, ...) =
 	(void *)BPF_FUNC_trace_printk;
  static int (*get_smp_processor_id)(void) =
 	(void *)BPF_FUNC_get_smp_processor_id;
  static int (*perf_event_output)(void *, struct bpf_map_def *, int, void *, unsigned long) =
 	(void *)BPF_FUNC_perf_event_output;

  struct bpf_map_def SEC("maps") channel = {
 	.type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
 	.key_size = sizeof(int),
 	.value_size = sizeof(u32),
 	.max_entries = __NR_CPUS__,
  };

  SEC("func_write=sys_write")
  int func_write(void *ctx)
  {
 	struct {
 		u64 ktime;
 		int cpuid;
 	} __attribute__((packed)) output_data;
 	char error_data[] = "Error: failed to output: %d\n";

 	output_data.cpuid = get_smp_processor_id();
 	output_data.ktime = ktime_get_ns();
 	int err = perf_event_output(ctx, &channel, get_smp_processor_id(),
 				    &output_data, sizeof(output_data));
 	if (err)
 		trace_printk(error_data, sizeof(error_data), err);
 	return 0;
  }
  char _license[] SEC("license") = "GPL";
  int _version SEC("version") = LINUX_VERSION_CODE;
  /************************ END ***************************/

  # perf record -a -e bpf-output/no-inherit,name=evt/ \
                    -e ./test_bpf_output.c/map:channel.event=evt/ ls /
  # perf script | grep ls
     ls  2242 [003] 347851.557563:   evt: ffffffff811fd201 sys_write ...
     ls  2242 [003] 347851.557571:   evt: ffffffff811fd201 sys_write ...

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Cody P Schafer <dev@codyps.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jeremie Galarneau <jeremie.galarneau@efficios.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kirill Smelkov <kirr@nexedi.com>
Cc: Li Zefan <lizefan@huawei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1456132275-98875-11-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2016-02-22 14:37:21 -03:00
..
arch perf tools: Rename parse_events__free_terms() to parse_events_terms__delete() 2016-02-12 17:09:17 -03:00
bench perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
config perf build: Add libcrypto feature detection 2016-02-05 09:46:45 -03:00
Documentation perf record: Add --all-user/--all-kernel options 2016-02-18 10:48:44 -03:00
jvmti perf jvmti: Add check for java alternatives cmd in Makefile 2016-02-16 17:12:46 -03:00
python perf python: Support the PERF_RECORD_SWITCH event 2015-10-07 19:41:50 -03:00
scripts perf python scripting: Append examples to err msg about audit-libs-python 2016-02-12 11:30:27 -03:00
tests perf tools: Apply tracepoint event definition options to BPF script 2016-02-22 13:02:44 -03:00
trace/strace/groups perf trace: Add read/write to the file group 2015-09-04 13:22:06 -03:00
ui perf tools: Fix assertion failure on dynamic entry 2016-02-22 12:07:14 -03:00
util perf tools: Introduce bpf-output event 2016-02-22 14:37:21 -03:00
.gitignore perf tools: Add Intel PT instruction decoder 2015-08-17 11:11:36 -03:00
Build perf tools: Set and pass DOCDIR to builtin-report.c 2016-01-12 12:42:07 -03:00
builtin-annotate.c perf hists: Introduce perf_evsel__output_resort function 2016-02-03 11:13:11 -03:00
builtin-bench.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
builtin-buildid-cache.c perf tools: Move timestamp creation to util 2016-01-29 17:30:06 -03:00
builtin-buildid-list.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
builtin-config.c perf config: Add '--system' and '--user' options to select which config file is used 2016-02-12 10:54:46 -03:00
builtin-data.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
builtin-diff.c perf diff: Use perf_hpp__register_sort_field interface 2016-01-08 12:59:30 -03:00
builtin-evlist.c perf evlist: Add --trace-fields option to show trace fields 2016-01-08 14:23:02 -03:00
builtin-help.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
builtin-inject.c perf inject: Add jitdump mmap injection support 2016-02-05 09:46:45 -03:00
builtin-kmem.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
builtin-kvm.c perf kvm/powerpc: Port perf kvm stat to powerpc 2016-01-29 17:49:54 -03:00
builtin-list.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
builtin-lock.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
builtin-mem.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
builtin-probe.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
builtin-record.c perf record: Apply config to BPF objects before recording 2016-02-22 12:28:02 -03:00
builtin-report.c perf report: Check error during report__collapse_hists() 2016-02-19 19:17:50 -03:00
builtin-sched.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
builtin-script.c perf script: Align event name properly 2016-01-08 12:57:26 -03:00
builtin-stat.c perf stat: Bail out on unsupported event config modifiers 2016-02-19 19:12:49 -03:00
builtin-timechart.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
builtin-top.c perf top: Move UI initialization ahead of sort setup 2016-02-03 12:24:03 -03:00
builtin-trace.c perf subcmd: Create subcmd library 2015-12-17 14:27:14 -03:00
builtin-version.c perf tools: Move cmd_version() to builtin-version.c 2015-12-09 13:42:03 -03:00
builtin.h perf tools: Add 'perf config' command 2015-11-23 18:31:24 -03:00
command-list.txt perf tools: Do not show trace command if it's not compiled in 2016-01-08 12:46:17 -03:00
CREDITS
design.txt perf tools: Update some code references in design.txt 2014-03-18 18:17:06 -03:00
Makefile perf build tests: Do parallell builds with 'build-test' 2016-02-04 15:57:00 -03:00
Makefile.perf perf build: Add EXTRA_LDFLAGS option to makefile 2016-02-12 11:30:20 -03:00
MANIFEST perf tools: Add missing sources to perf's MANIFEST 2016-01-11 12:09:25 -03:00
perf-archive.sh
perf-completion.sh perf tools: Avoid confusion with preloaded bash function for perf bash completion 2015-03-19 13:53:27 -03:00
perf-read-vdso.c perf tools: Build programs to copy 32-bit compatibility 2014-10-29 10:32:48 -02:00
perf-sys.h perf tools: Move generic barriers out of perf-sys.h 2015-05-08 16:05:08 -03:00
perf-with-kcore.sh perf tools: Fix perf-with-kcore handling of arguments containing spaces 2015-08-06 16:48:27 -03:00
perf.c perf tools: Initialize libapi debug output 2016-02-16 17:12:59 -03:00
perf.h perf record: Add --all-user/--all-kernel options 2016-02-18 10:48:44 -03:00